Study on Vibration Transmission Characteristics of Metal Diaphragm Coupling Based on Virtual Material Method
It is very difficult to carry out the vibration performance test of metal couplings of large ships due to the large size and high cost of the test bench,so it is of great significance to study the corresponding simulation calculation method with high efficiency and high precision.The traditional accurate numerical simulation method has the disadvantage of many grids and low efficiency,so,in this paper,the virtual material method is used to simulate the metal coupling of the ship and test it experimentally for verification.First of all,the parameters of the virtual material layer of the bolt are obtained through calculation and test,and all the bolted joints of the large metal coupling are simplified and modeled.Then,the stiffness characteristics,modal characteristics,impedance characteristics and vibration transmission characteristics of the metal diaphragm coupling are obtained through this method,and the calculation efficiency is compared with that of the traditional modeling method.Finally,a coupling vibration performance test bench is built and the test is performed for verification.The results show that the simulation efficiency of coupling vibration performance using this virtual material method is raised by 73.9%.The average error between the stiffness of four groups of coupling diaphragm assemblies using the virtual material method and the coupling stiffness measured in the test is 2.61%.The average error of stiffness measured with the bolted model is 1.15%.The average error between the simulation and test of the modal frequencies of the first five orders of the metal diaphragm coupling is 9.91%.In the 10-2 000 Hz frequency band,the errors between the simulation and test of the axial and radial impedance of the metal diaphragm coupling are 1.9 and 2.8 dB.The errors of simulation and test of axial and radial vibration level drop of the metal coupling are 4.69 and 3.41 dB.The error between the test and simulation results is small and meets the requirements of engineering accuracy,which verifies the efficiency and accuracy of this method.
vibration and wavemetallic diaphragmcouplingfinite element analysisvirtual material methodmechanical impedance
万方数据
维普
